2525665491 has 6 divisors (see below), whose sum is σ = 3648183500. Its totient is φ = 1683776988.

The previous prime is 2525665481. The next prime is 2525665517. The reversal of 2525665491 is 1945665252.

2525665491 is a `hidden beast` number, since 2 + 52 + 56 + 6 + 549 + 1 = 666.

It is not a de Polignac number, because 2525665491 - 2²² = 2521471187 is a prime.

It is a super-3 number, since 3×2525665491³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2525665481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 140314741 + ... + 140314758.

Almost surely, 2^2525665491 is an apocalyptic number.

2525665491 is a deficient number, since it is larger than the sum of its proper divisors (1122518009).

2525665491 is a wasteful number, since it uses less digits than its factorization.

2525665491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280629505 (or 280629502 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The square root of 2525665491 is about 50255.9995522923. Note that the first 3 decimals coincide. The cubic root of 2525665491 is about 1361.8374620868.

Adding to 2525665491 its sum of digits (45), we get a square (2525665536 = 50256²).

The spelling of 2525665491 in words is "two billion, five hundred twenty-five million, six hundred sixty-five thousand, four hundred ninety-one".